Back-On (stylized as BACK-ON) is a Japanese rock band from Tokyo, Japan. They are recognized for creating anime and game opening themes such as the Tales of the World: Radiant Mythology 2 opening theme, "fly away"; Air Gear opening theme, "Chain"; Murder Princess opening theme "Hikari Sasuhou (fk Metal ver.)" and Eyeshield 21s "Blaze Line". etc., although they have also written ending themes for both anime and TV shows. These include "flower" and "a day dreaming..." for Eyeshield 21, and "Butterfly" for the late-night TV drama Shinjuku Swan, and most recently "Sands of Time" for the mobile robot TV drama Keitai Sousakan 7 and "Strike Back" for the continued run of the shounen anime series Fairy Tail. They formed a new band called BAReeeeeeeeeeN (バリーン, Barīn) with the 4-man band GReeeeN, produced by Jin (so 10 people = 10 e's) and their debut single "Ashiato" came out on October 1, 2008. The song reached No. 1 in the USEN and chaku-uta digital download charts. The band's singles "Flyaway" and "Where Is the Future?" were created as the theme music for the PSP game Tales of the World: Radiant Mythology 2, which was released exclusively in Japan on January 28, 2009. Their single One Step!/Tomorrow Never Knows was released on January 27, 2010; "Tomorrow never knows" was used as the background theme music for the DyDo coffee commercial featuring Teppei Tajima, the Japanese surfer. In 2013/14, the band composed and performed two opening themes for the anime, Gundam Build Fighters, called "Nibun no Ichi" (ニブンノイチ, "One Half") and wimp ft. Lil' Fang (from FAKY); the latter features vocals by Lil' Fang from the band FAKY and aired from episode 14 onwards. Both singles were released as three versions: CD-only, CD+DVD (with videos) and CD+gunpla plastic model.